The main way to add your existing contacts to PhoneSlate is by importing a contacts file. First, navigate to the Contacts page by clicking the Address Book button.
On the Contacts page, you can view, add, or edit contacts for a team. You can see the team you're currently working in, and switch teams, with the Team Toggle next to the PhoneSlate logo in the navigation bar.
You can add individual contacts to your team here using the large red Add (+) button, or import a contacts file using the import tool.
The import tool allows you to import contacts files in CSV format from Google or Microsoft Outlook. The import cool can often import contacts from other sources as well, as long as the contacts are in an Outlook-formatted CSV. To see an example of the CSV headers PhoneSlate expects, see the attached sample CSV file.